In one of our tests here at the school where I work we had the following question:
Which adjective can be used to describe a person?
The correct answer was wacky, but among the incorrect ones, there was the adjective squeaky. Based on the dictionary definition I concluded that the latter would also be possible. When I sent an e-mail to our headquarter, they answered that squeaky would not be right because we would have to understand the adjective figuratively if we were to accept it. I confess I didn't understand their explanation.
Can we say "he is squeaky" or would we have to say "he has a squeaky voice"?
I was thinking of a meaning close to what the person sounds like.
It's worth mentioning that one member of the Manson family was Lynette Alice "Squeaky" Fromme. ( from Wikipedia: George Spahn gave her the nickname "Squeaky", because of the sound she made when he touched her.)
I also thought about a possible connection with the adjective and the saying "The squeaky wheel gets the grease."
In the case of Lynette, couldn't squeaky mean someone who speaks in squeaky sounds? And, in the second case, could it mean someone who complains a lot?